Reference books

HOW CAN I GET the complete cyber security course vol 2, 3, AND 4?

On you can choose specific bundle with those courses or you can choose VIP membership and have access to all courses here.

If you are talking about e-book then we don’t have ebooks for vol 2,3, and 4. If you are talking about the course purchase then you can follow the steps that @Igi talked about in the above post.